[Easy] Reuse source variable in wrap_tensor

[awgu]

Stack from ghstack (oldest at bottom):

• -> [Easy] Reuse source variable in wrap_tensor #98845
• [Dynamo] De-dup graph inputs #98775

pytorch/torch/_dynamo/variables/builder.py

Lines 759 to 760 in 2fab289

	def wrap_tensor(self, value: torch.Tensor):
	source = self.get_source()

We already save source = self.get_source() to begin wrap_tensor(). Since the source should be fixed at VariableBuilder construction time, we should be okay to reuse the source variable instead of calling get_source() every time.

cc @soumith @voznesenskym @penguinwu @anijain2305 @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @Xia-Weiwen @wenzhe-nrv @jiayisunx @desertfire

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[awgu]

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